Easyui-window contains an IFRAME, how to close window in an IFRAME

I tried something like $ (' #win '). Window (' close ');
Reported $.data...options invalid error, I have introduced the JS file, the path is not a problem, and on the same page, no IFRAME can be closed

In the IFRAME page, I tried to close the window windows by calling the $ (parent.document). Find (' #win ') method, but reported JS error: $.data...options is invalid.

Workaround: parent.$ (' #win '). Window (' close ');
or window.parent.$ (' win '). Window (' close ');

Easyui-window contains an IFRAME, how to close window in an IFRAME